Malicious PDF — malware analysis report

Static analysis result for SHA-256 811b4218a68b3e56…

MALICIOUS

PDF

47.6 KB Created: 2020-08-14 06:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd94764685be0c21bbace7f62be8bee0 SHA-1: 232dc937b051cdf50280ffc8211a733bef2ab2f8 SHA-256: 811b4218a68b3e5665fdcf6c44387b6bac06f3e9eaa848b30580c82442b3dcf4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Financial feasibility report meaning' and the 'wkhtmltopdf' tool, suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=financial+feasibility+report+meaning
    • http://files.uottawabgsa.ca/uploads/1/3/0/7/130739731/01b5713f100.pdf
    • http://files.stephhaxton.com/uploads/1/3/0/7/130739069/resetazaj.pdf
    • http://files.mydaybydaydiary.com/uploads/1/3/1/6/131606431/fixipevedivamonon.pdf
    • http://belawezu.esmacats.com/uploads/1/3/1/3/131398134/6a086c7b72fa456.pdf
    • https://cdn.shopify.com/s/files/1/0433/6975/8874/files/ruvabilarodusan.pdf
    • https://cdn.shopify.com/s/files/1/0434/2729/9478/files/attestation_sur_l_honneur_gouv_fr.pdf
    • https://cdn.shopify.com/s/files/1/0440/1197/8902/files/pemanfaatan_bonggol_pisang.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/wazowoxupezal.pdf
    • https://cdn.shopify.com/s/files/1/0448/3697/8849/files/healthy_keto_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0436/1053/8147/files/17493222859.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/cardiothoracic_surgery_instruments.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/46739129701.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2728/files/82494418461.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/cube_world_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7269/files/tipubuwelig.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8845/files/cerfa_taxe_formation_professionnelle.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ba6.bin
0006e58d254e6a6a7970e4faf33d486fde1f1a2eba966f4edc6277355b84ca41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA6 5532 bytes
font_01_sfnt_off00008e5e.bin
f19a6b2a46e94eb62d572a1e3a152502852d0ca0f71473bffb97e252ecd6036d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5E 10304 bytes

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